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The change in sysctl should take effect immediately. Since each case is different, the best way to determine whether a setting is good or bad is to try it out.

You may try to modify the following dtrace script. https://forums.freebsd.org/threads/sharing-of-dtrace-scripts.32855/#post-182070

You can use dtrace to find out which program called vop_fsync.

Maybe it is writing metadata.

Your pool is quite full. How fragment is it?

Run grep -R -i -I preemption /usr/src/sys, I get 144 lines including /usr/src/sys/arm64/conf/GENERIC:options PREEMPTION # Enable kernel thread preemption

I would recommend to do a test run first. I use ZFS on a desktop. But there is still some activities on ZIL. In fact, one-seventh of the writes came from ZIL. zpool iostat -v tank 744G 1.45T 4 5 1.02M 78.2K raidz1 744G 1.45T 4...

Actually, they are vfs.zfs.free.max.blocks and vfs.zfs.free.min.time.ms. And you can get a list of sysctl zfs variables with a line of description by using sysctl -d vfs.zfs

It is better to ask on the fs mailing list. You may also try to use linux or openindiana to import the pool.

Definitely file a bug report.

I am tracking 11-stable and I also had this problem. Instead of the usual buildworld buildkernel installkernel installworld I had to buildworld installworld buildkernel installkernel

Since you are using SSD, you may try disable prefetch. #sysctl vfs.zfs.prefetch_disable=1

I would suggest the following two tests. 1. disable trim 2. drastically limit arc to say, 16G or 32G.

To mount a zfs filesystem with canmount option set to off, you can use the good old mount command. First import the pool, then mount -t zfs what-you-want-to-mount mountpoint

Run this script with the -C flag, as in the first line of the code. #!/usr/sbin/dtrace -Cs

I do not use jail. But I would guess you use the interface tap0 for jails. Also, I had encountered a problem that hot swap does not work when vmm.ko is loaded.

zpool list show raw capacity while zfs list show actual capacity.

$ pkg which /usr/local/bin/startx /usr/local/bin/startx was installed by package xinit-1.3.4,1

First import the pool. Then run # zfs mount -o mountpoint=somewhere path-to-root-filesystem You can find the root filesystem by using zfs list.

Somehow the newer devel/libpthread-stubs install only /usr/local/libdata/pkgconfig/pthread-stubs.pc without the necessary libraries. If you are using portmaster, you could just # pkg install /usr/ports//usr/ports/packages/portmaster-backup/libpthread-stub* And when running portmaster, add a...